I found a UK site that has these measurements.
Neck Circumference in line with Adams Apple
XS-S 30-33cm
M-ML 34-38cm
L 39-43cm
XL-XXL 44-47cm
3XL 48-51cm
Neck Circumference in line with Adams Apple
XS-S 30-33cm
M-ML 34-38cm
L 39-43cm
XL-XXL 44-47cm
3XL 48-51cm